Pete Alonso didn’t climb up the Mets’ home run leaderboard on talent alone.

Preceding all of Alonso’s record-setting homers and tape-measure blasts are hours of preparation behind the scenes, which is what manager Carlos Mendoza says stands out most about the Mets ’ All-Star first baseman.

“He’s watching film 24/7,” Mendoza said. “We could be on a flight and you walk by his seat, and he’s got his iPad, his notebook, and he’s watching the whole pitching staff from the team that we’re about to face.

“That says a lot. It could be after an 0-for-4 game or a tough loss, and he’s on the plane and it’s the same routine.”

Mendoza’s comments came on Tuesday afternoon, less than 24 hours after Alonso hit the 251st home run of his career to move within one of Darryl Strawberry’s franchise reco

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